Safety gas-burner



Nov. 30, 1937. H. ARQUINT SAFETY GAS BURNER Filed June 12, 1935 2 Sheets-Sheet l 9N NN NN ficaemior;

HANS

ARQUINT Nov. 30, 1937. H. ARQUINT SAFETY GAS BURNER 2 Sheets-Sheet '2 Filed June 12, 1935 I III)" llln Ow QM mama HANS A'RQU/ N T Patented Nov. 30, 1937 UNITED STATES PATENT OFFICE Application June 12, 1935, Serial No. 26,2841

' Germany June 15, 1934 5 Claims. (o1. 158-1171) The present invention relates to improvements in a safety cut-ofl' device for gas burners of the find where the admission of gas to the burner is cut oil if the pilot flame should be extinguished.

An object of this invention is to provide a gas flow control device comprising a manually actuated stop cock and a thermostatically actuated poppet valve for separately controlling the flow of gas to a burner in which the-stem of the poppet valve is slidably mounted in the plug or body oi the stop cock.

Another object of this invention is to provide a gas flow control device comprising a manually actuated stop cock and a thermostatically actuated poppet valve for separately controlling the flow of gas to a burner in which the stem of the poppet valve is slidably mounted in the plug or body of the stop cock and said poppet valve is urged to a closed position by a spring and adapted to be opened by the thermostat.

With these and other important objects in view, which may be incident to my improvements, the invention resides in the parts and combinations to be hereinafter set forth and claimed, with the understanding that the several necessary elements comprising in construction, proportions and arrangement, without departing from the spirit and scope of the appended claims.

In order to make the invention more clearly understood, there is shown in the accompanying drawings means for carrying the same into prac tical eifect without limiting the improvements in their useful applications to the particular constructions which, for the purposes of explanation, have been made the subject of illustration.

In the drawings:

Figure 1 is a vertical longitudinal sectional view of a gas burner control constructed according to one form of the invention;

Fig. 2 is a similar view of a portion of a modified form;

Fig. 3 is an end in Fig. 1;

Fig. 4 is a detail view of limit guide;

Figs. 5 and 6 are detail views of a lever of the thermostat; and

Fig. 7 is a vertical longitudinal sectional view of another modified form of the invention.

Referring to the drawings, the general arrangement of the control device comprises a valve chest or casing I provided with a main gas nozzle 2 feeding the burner, a gas inlet 8, a seat for the manually-actuated rotatable gas cock plug 4, a chamber 5 enclosing the transmission lever 34 view of the structure shown my invention may be varied' 36, and bosses 3 and t sup= Besides, there the pilot gas and closed by a cap porting the thermostat rod 24'. is a passageway 8 for the flow of supply from the gas inlet 6 to the t and a passageway it from this seat to a chamber til formed in boss 3 and closed by a screw cap 8. a

The rotatable plug or body 4 of the manually actuated gas cock is of hollow construction and is provided with a central axially extending tubular boss 4' in which is axially slidably mounted the hollow tubular stem of the thermostatically actuated main valve iii. This valve is of the poppet type and is resiliently urged against its seat ill by a coil spring 9. The plug 8 is provided with a port 4" adapted to register with the gas inlet 6. When the plug 4 is in the position shown in Fig. 1 with the port I" registering with inlet 6, gas will flow from the inlet 6 through port 4" into the annular chamber in the plug 4 around the head of valve Hi (When in of valve Hi. This construction causes valve I it to rotate with plug 4 to efiect a grindingaction between valve in and its seat, thereby insuring sion 1 of the valve In and is retained in adjusted positions by frictional engagement with the split extension.

The gas cock is retained on its seat against the pressure of spring 9 by .a flat spring 28. A stop pin 30, carried by plug 4 and movable through an arcuate cut-away portion 30' of casing i, limits the rotary movement of the cock to about 135. An intermediate position is indicated by a spring catch 29 (Fig. 4) which engages pin 80. In this intermediate position, the port 4" of the cock is out of register with inlet 6, so that the gas supply to the burner is cut oil completely. The pilot'gas supply through passageway 8 is still left open. In this position, the pilot flames 26 and 21 will burn. By further turning the plug over said spring catch 29 into its extreme closed position, the pilot gas supply will also be cut oil.

The pilot gas supply flows through passageway 8 into the circumferential groove [4 surrounding plug 4. A longitudinal peripheral groove l5 communicates with groove 8 and passageway l6 termed in the upper portion of casing I. Thegroove l5 extends through an are sufficient to provide communication between groove 8 and passageway l6 during all movement of plug 4 from full open to slightly beyond full closed positions. This enables the gas supply to the pilot light to remain open, even after the plug 4 has been moved to a closed position, as indicated by engagement of pin 36 with spring-catch 29. Upon further movement of plug 4 in the closing direction, the groove l5 will be shifted out of register with passageway l6 and the flow of gas to the latter will be stopped. This position is determined by engagement of pin 36 with one end of the recess 36'.

The thermostat comprises an inner member made of invar steel having a very small coeflicient of expansion. This inner member, according to Fig. 1, comprises a rod 24 secured to the head of the expanding outer tubular member of the thermostat and an attached tubular member 24' extended into the chamber H, where it is provided with a calibrated inlet nozzle IQ for the flow of gas to the pilot. Tubular member 24' is also provided with an outlet opening 23 communicating with the annular space between inner and outer members 24 and 25, respectively, of the thermostat. The outer member 25 has holes. 26 in its underside for the heating flames, while a hole 21 in the front wall of said annular space feeds the pilot flame for lighting the burner.

The tubular member 24 extending into chamber I1 is threadedly connected to a carrier sleeve 2| carrying a split clamping ring 26 which frictionally engages a controlling sleeve 22.

The frictional engagement between ring 26 and the sleeve 22 is sufficient to cause the sleeve 22 to move with ring 26 and the tube 24' through the limited stroke afforded within chamber l1. In this connection, it will be noted that the portion of sleeve 22 within chamber I1 is nearly as long as the distance between the end of chamber 11 closed by cap l8 and the opposite end thereof. This limits the stroke of sleeve 22 within chamber l1 to a distance suificient to effect full opening and closing of valve l6. The frictional engagement between sleeve 22 and ring 26 enables the ring 26 and the tubular member 24 ,to further move after sleeve 22 has reached its limit of movement.

An opening 22 is provided in the outer end of sleeve 22 to permit the flow of gas from passageway I6 into chamber I1, even when sleeve 22 is against cap l8. From chamber H, the gas flows through a calibrated nozzle l9 through tube 24' and port 23 into the interior of tube 25 and thence out through openings 26 and 21. Access to nozzle IQ for replacement is obtained by removal of cap l8.

Sleeve '22 is provided with a projecting portion which extends through the inner end of chamber I1 into the chamber 5. A lever 34 mounted on fulcrum pivot 33 in chamber 5 has its upper short arm forked to freely embrace tube 24' and provided with lugs 32 to engage the projection of sleeve 22. The lower long arm of lever 34 engages the contact screw l I.

In Fig. 1, the lever 34 is in the position which it assumes when the tube 25 is cold, due to the absence of flames from openings 26. After the gas flowing from these openings is ignited, the tube 25 is heated and expands, causing the tube 24', ring 26 and sleeve 22 to shift to the left (Fig. 1). Displacement of sleeve 22 rocks lever 34 to open valve l6 against the action of spring 9.

Opening of valve l6 places the interior of plus 4 into chamber in communication with chamber 5 and when the port 4" is in register with inlet 6, gas will flow 5 and out through nozzle 2 to the burner.

If, for any reason, the burning gas flowing through openings 26 should be extinguished, the tube 25 would cool down and contract. This would cause the sleeve 22 to shift to the right (Fig. 1) and permit valve l6 to close, shutting off the flow of gas through chamber 5 and nozzle 2 to the burner. v As shown in Fig. 2, the construction may be modified by positioning a sleeve 22a directly on tube 24 for transmitting the movement of the tube to the lever 34.

Figs-5 -and 6 illustrate how the'leverage ratio of lever 34 may be varied within large limits by displacing the lugs 32 on the shorter arm of lever 34.

In Fig. 7, a modified form of the device of Figs. 1-6 is shown.

The apparatus of Fig. '7 comprises a valve chest or casing 51 provided with a main gas nozzle 21!. feeding the burner, a gas inlet 59 a seat for the manually-actuated rotatable gas cock plug or body- 411, a chamber 5a enclosing the transmission lever 34a and closed by a cap 36a and means for supporting a thermostat.

Rotatable cock plug 40, which is held on its seat by spring 28', is of hollow construction and is provided with a port 4d adapted to register with gas inlet 59 for the admission of gas into the space 4e in plug 4a which opens into valve chamber l6b. An axially extending tubular boss 40 is formed within the plug 4a and slidably receives the tubular stem I60 of poppet valve I6a. A spring 9a urges valve I60, onto a valve seat 16d to close communication between chambers I61) and 5a. Valve l6a is caused to rotate with plug 411 by means of a pin 66 carried by valve stem I6c and slidably positioned in the axially extending slot formed. in boss 40. By reason of this construction, valve |6a is rotated on its seat when plug 4a is turned and insures a tight fit between valve Wu and its seat.

Valve we is shifted from its seat by means of a plunger 53 extending through valve stem l6c. Plunger 53 is provided with an enlarged head 55 adapted to engage valve I61: and has an adjusting contact screw 54 extending axially therethrough for engaging the lower end of lever 34a. The head 55 of plunger 53 is flattened on its sides and is received between lugs 56 carried by lever 34a. to prevent rotation of plunger 53. It will be realized that by adjusting screw 54, the opening of valve l6a relative to the position of lever 34a maq be varied.

The bore within boss 40 extends completely through plug 4a and is enlarged at its outer end to form a compartment 4g in which is mounted a valve body 56 carried on the end of plunger 54. This valve 56 serves to close communication between the compartment 4! in boss 40 and compartment 4g by seating on the shoulder formed between these two compartments. Valve 56 is urged onto its seat by a coil spring 5| which engages cap 4b closing compartment 4g. The lever 34a opens valve 56 by displacing plunger 53, and in this connection it will be noted that the head 55 is so positioned relative to valve No that valve 56 is opened prior to valve l6'a.

Gas for the pilot light flows from inlet 59 through passageway 58 into recess 52' formed on the periphery of plug 4a and thence through duct 52 in plug 4a into compartment 4f. when valve 50 is open, the gas flows from compartment 4! into compartment 40 and through duct 49 into 45 allows the gas to flow from chamber 45' into chamber 44a. From the latter chamber, the gas flows to the pilot nozzle 31, as will be described hereinafter.

As described hereinbefore, the flattened head 55 of plunger 53 prevents this plunger and valve 50 carried thereby from rotating. Thus, when plug 4a is rotated, a grinding action between valve 50 and its seat will take place.

1 The thermostat comprises a holding tubular casing 39 secured to the boss 3a of the casing 51 by a union nut 3b. The attaching end of tube 39 is flanged and carries a flanged bushing 39' which bears against the end of and partially enters boss 30. The outer end of tube 39 carries end of tube 38 is anchored to bushing 39a and the inner end is slidably supported by bushing A tubular fitting 40 is secured to the inner end of tube 38 to slide therewith. Friction ring 4! thermostat thereto to open valves 10a and 5!).

Tube 38, fitting 40, screw 4| and sleeve 42, 43 have a passage therethrough for the flow of gas from chamber 44' to nozzle 31. The flow of gas through this passage is calibrated by nozzle 44, which may be replaced by removing cap W.

In addition to the path of flow of gas from inlet 59 through passageway 58, recess 52, duct 52, chambers 4f, 49, duct 49, recess 41, duct 45a to chamber 45', etc., to the pilot light nozzle, there is provided an auxiliary flow path. For

chamber 46d is provided in the inner end of guide 4627, which is connected by duct 46c with socket 46a. The chamber 46d is closed by a valve on the end of stem 46 normally held in a closed position by spring 46). It will be realized that by pushing on knob 48 to open 'valve 46, gas will flow from into chamber 4611 into chamber 45' and thence to pilot nozzle 31 as hereinbefore described.

At this point it should be 41 and 52' extend circumferentially of the plug tion. This allows the pilot light to remain lit after the flow of gas to burner B has been manually shut off.

When the thermostat is cold, both valves I lie and 50 will be closed, and since gas cannot flow through duct 52 etc., to the pilot, it is necessary to push knob 48 to open the auxiliary flow path from inlet 58 by way of valve 48 to the pilot.

knob 48 may be released and the pilot will burn with gas supplied through the regular channel. After the thermostat has been further heated, the valve Illa will be opened to gas to the burner. Then, the maybe maTr'iiIally controlled by the plug ea.

To facilitate lighting of the pilot, a tube M the pilot only by pressing knob 48 as explained hereinbefore.

2. A safety cut-oil device for gas burners, comprising a valve chest having an inlet for the admission or gas and a closed chamber for a transmission lever, a main gas nozzle for feeding gas to a burner, a rotatable gas cock between said chamber and the gas inlet, said gas cock having a main passageway and passageways for the pilot gas, a main gas valve in the main passageway of the cock having a hollow stem slidingly held in an axial bore of the cock, an adjustable contact screw carried by said main valve and projecting into the chamber of the valve chest, a helical spring urging the main valve to a closed position, a thermostat comprising a tubular expanding member and a movable member formed as a conduit for the flow of pilot gas and ending in a chamber communicating with the passageways of the gas cock, a calibrated nozzle fitted into said end of the movable member of the thermostat, and a transmission lever arranged in said chamber of the valve chest and being in operative contact with the movable member of the thermostat and the adjustable screw of the main valve.

3. A safety cut-ofi device according to claim 2, in which the valve stem is slotted and in which the cock is provided with a carrier pin engaging in the slot of the valve stem for rotating said stem and grinding the valve on its seatat each turning movement of the cock.

4. A safety control device for gas burners, comprising a valve chest having a gas inlet and divided into a valve chamber and a thermostatlever chamber, said valve chamber communi eating with said gas inlet and said lever chamber, a gas outlet nozzle for the flow of gas from said lever chamber to a gas burner, a manually-actuated plug valve in said valve chamber and provided with communicating radial and axially extending portsfor the flow of gas into said valve chamber when the radial port is in register with the gas inlet, said plug having an axially extending tubular boss and an enlarged bore communicating with the interior of said boss, a poppet valve for closing communication between said valve and lever chambers, said poppet valve having a tubular stem slidably mounted within the bore of said boss, a spring urging said poppet valve to a closed positio a plunger extending through said tubular valve stem having a head on one end and a pilot control valve on the other and within the enlarged bore of said plug for shutting said large bore from the bore in said tubular boss, a spring urging said pilot control valve to a closed position, a tubular thermostat having a pilot light nozzle therein adjacent one end thereof, means tor mounting said thermostat on said valve chest with said pilot light positioned adjacent the burner, said thermostat having a tubular movable member extending through said lever chamber into a pilot feed chamber provided in said chest, said chest having passages connecting said pilot feed chamber and said inlet with said valve chamber, said plug having passages therein connected to the bore in said boss and the enlarged bore respectively and adapted to register with the passages in the chest to conduct gas from the inlet to the pilot teed chamber, and a pivoted lever in said lever chamber having one end contacting with said plunger and the other end actuated by the movable member or the thermostat to open said poppet and pilot valves against the action of their springs.

5. A device according to claim 4, in which the chest and plug are provided with communicating passageways forming an auxiliary path of flow for gas from said inlet to said pilot iced chamber, and a spring-closed manually-opened valve in said auxiliary flow path for admitting gas to said pilot when said thermostatically actuated pilot control valve is closed.

HANS ARQUINT. 

